package com.zch.standard;

public class InputAndOutput {
    public static void main(String[] args) {
        //编译类型：public static final InputStream in = null;
        //运行类型：BufferedInputStream
        System.out.println(System.in.getClass());
        //编译类型：public static final PrintStream out = null;
        //运行类型：PrintStream
        System.out.println(System.out.getClass());
    }
}
